Soft bumps on the buttocks i.e. pimples on the buttock skin may be caused by folliculitis, eczema, warts and other reasons. 1. Folliculitis: due to sitting for a long time, pants are not breathable, when the immune system is low and personal hygiene is poor, it is easy to cause follicle infections, red pimples, manifested as soft bumps. 2. Eczema: a variety of internal and external factors, such as allergies and other causes of inflammation of the superficial dermis and epidermis, the appearance of erythema, papules can be accompanied by itching. 3. Condyloma acuminatum: If the bumps are around the anus and vulva, they may be caused by human papilloma virus infection. Usually the texture is soft, and the rash has a tendency to gradually increase in size. If there are buttock skin pimples, it is recommended to go to the hospital in time, under the guidance of the doctor to clarify the cause, and targeted treatment or treatment.